Universal Lift Support (4247) by StrongArm®. Body Connection: Ball Socket (Nylon) 10 mm. Shaft Connection: Ball Socket (Nylon) 10 mm. Compressed Length: 11.75". Extended Length: 19.7". Travel Length: 7.95". Capacity: 51 Lbs. StrongArm Universal Lift Support designed utilizing the latest technology. Designed with ultimate quality and durability in mind. This product will provide reliable service for decades to come.